Physics307L:People/Ozaksut/Notebook/071128

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because electrons are bound, total energy is zero...
therefore, kinetic energy of electrons = potential energy of electrons.
kinetic energy is 1/2mv^2
change in potential energy of the electron = charge of electron x change in electrical potential of the anode

1/2mv^2=eV

electron travels in a circle, because there's a magnetic field toward us, and the velocity is tangent to the circle, and magnetic force on the electron is -evxB. toward center.